The three modes of the electric control system (ECS) connecting into the distributed control system (DCS) in thermal power plant are analyzed

i.e. control cables

control cables and communication

full communication. The merits and shortcomings of the three modes and the problems in actual application are discussed. The mode of control cables and communication is considered to be a mainstream solution for connecting ECS into DCS with the capability of greatly improving the automation level of ECS. However

such problems are still existed in the application as limited communication between ECS and DCS

that the functions of maintenance and management are not perfect etc. It is believed that these problems can be solved gradually by the maturity and stability of communication technology and the mode of full communication without control cables will be broadened gradually.